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s * t = 56
s + t = 15
Despejo s en ecuación 2
s + t = 15
s = 15 - t
Sustituyo el despeje de s en ecuación 1
s * t = 56
(15 - t) * t = 56
15t - t² = 56
- t² + 15t - 56 = 0
t₁ = - (- 15) + √((15)² - 4 (56))/2
t₁ = 15 + √(225 - 224)/2
t₁ = 15 + √1/2
t₁ = (15 + 1)/2
t₁ = 16/2
t₁ = 8
t₂ = (15 - 1)/2
t₂ = 14/2
t₂ = 7
Los números que buscas son: 7 y 8